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Special requirements for R32 units
Installer and user reference guide
68
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
installed in the lowest underground floor, the total charge of the system
MUST
be
less than the limit that is derived from the graph. If NOT, change the installation
and repeat all of the above steps.
Possible changes:
-
Increase the area of smallest room connected to the same branch pipe port.
-
Reduce the indoor capacity connected to the same branch pipe port to equal
or below the limit.
-
Add additional countermeasures as described in applicable legislation. SVS
output or optional output PCB for indoor unit can be used to connect and
activate the additional countermeasures (e.g. mechanical ventilation). For
more information, see
"20.7 To connect the external outputs"
-
Split indoor capacity over two separate branch pipe ports.
-
Fine tune system with more detailed calculations in
.
NOTICE
The total refrigerant charge amount in the system MUST always be lower than 15.96
[kg]× the number of indoor units connected downstream of BS units, with a
maximum of 63.8 kg.
Example 1
VRV system serving three rooms via one BS unit. Room 1 (20 m²) is served by one
indoor unit (32 class) connected to port
A
. Room 2 (42 m²) is served by two indoor
units (2×50 class) connected to port
B
(no extension and liquid pipe size up has
been done). Room 3 (150 m²) is served by one indoor unit (200 class) connected to
ports
C
and
D
.
Port
A
serves only room 1: use the table under
Step 2
to find the maximum
capacity class of the indoor unit: 80. The selected indoor unit is 32 →
OK
.
Port
B
only serves room 2: use the table under
Step 2
to find the maximum
capacity class of the sum of the indoor units. 42 m² is rounded down to 40 m²: 100.
The sum of both indoor units is exactly 100 →
OK
.
Ports
C
and
D
are combined and have to be considered as one branch pipe. They
only serve room 3: Use the table under
Step 2
to find the maximum capacity class
of the indoor unit: 250. The selected indoor unit is 200 →
OK
.
50
50
200
b
a
Room 1
20 m²
Room 3
150 m²
Room 2
42 m²
D
C
B
A
32
c
c
A~D
Branch pipe port A~D
a
Outdoor unit
b
BS unit
c
Indoor branch kit (refnet)
Room
Room
32/50/200
Indoor unit capacity
